Appendix A: Class C Subnet Mask Cheat Sheet


This cheat sheet can come in handy when working with network addresses and subnet masks. A standard netmask is written 255.255.255.0 which is equivalent to the aggregate /24. Using aggregates has become popular because computer people tend to be lazy and it only requires three keystrokes.

Table A.1: Netmasks and Aggregates

Netmasks and Aggregates

Subnet Mask
Subnet Bits/Aggregate
Number of Subnets
Network Address

255.255.255.0
24
1
Host IP Range
1 - .254

Hex Mask
Host Bits
Hosts per Subnet
Broadcast Addresses
.255

0xffffff00
8
254

Subnet Mask
Subnet Bits/Aggregate
Number of Subnets
Network Address
.0
.128

255.255.255.128
25
2
Host IP Range
.1 - .126
.129 - .254

Hex Mask
Host Bits
Hosts per Subnet
Broadcast Addresses
.127
.255

0xffffff80
7
126

Subnet Mask
Subnet Bits/Aggregate
Number of Subnets
Network Address
.0
.64
.128
.192

255.255.255.192
26
4
Host IP Range
.1 - .62
.65 - .126
.129 - .190
.193 - .254

Hex Mask
Host Bits
Hosts per Subnet
Broadcast Addresses
.63
.127
.191
.255

0xffffffc0
6
62

Subnet Mask
Subnet Bits/Aggregate
Number of Subnets
Network Address
.0
.32
.64
.96

255.255.255.224
27
8
Host IP Range
.1 - .30
.33 - .62
.65 - .94
.97 - .126

Hex Mask
Host Bits
Hosts per Subnet
Broadcast Addresses
.31
.63
.95
.127

0xffffffe0
5
30

Network Address

Host IP Range

Broadcast Addresses

 

.128

.129 - .158

.159

 

.160

.161 - .190

.191

 

.192

.193 - .222

.223

 

.224

.225 - .254

.255

 

Subnet Mask
Subnet Bits/Aggregate
Number of Subnets
Network Address

255.255.255.240
16
Host IP Range

Hex Mask
Host Bits
Hosts per Subnet
Broadcast Addresses

0xfffffff0
4
14

.0

.1 “ .14

.15

 

.16

.17 - .30

.31

 

.32

.33 - .46

.47

 

.48

.49 - .62

.63

 

.64

.65 - .94

.79

 

.80

.81 - .94

.95

 

.96

.97 - .110

.111

 

.112

.113 - .126

.127

 

.128

.129 - .142

.143

 

.144

.145 - .158

.159

 

.160

.161 - .174

.175

 

.176

.177 - .190

.191

 

.192

.193 - .206

.207

 

.208

.209 - .222

.223

 

.224

.225 - .238

.239

 

.240

.241 - .254

.255

 

Subnet Mask
Subnet Bits/Aggregate
Number of Subnets
Network Address

255.255.255.248
32
Host IP Range

Hex Mask
Host Bits
Hosts per Subnet
Broadcast Addresses

0xfffffff8
3
6

.0

.1 “ .6

.7

 

.8

.9 - .14

.15

 

.16

.17 - .22

.23

 

.24

.25 - .30

.31

 

.32

.33 - .38

.39

 

.40

.41 - .46

.47

 

.48

.49 - .54

.55

 

.56

.57 - .62

.63

 

.64

.65 - .70

.71

 

.72

.73 - .78

.79

 

.80

.81 - .86

.87

 

.88

.89 - .94

.95

 

.96

.97 - .102

.103

 

.104

.105 - .110

.111

 

.112

.113 - .118

.119

 

.120

.121 - .126

.127

 

.128

.129 - .134

.135

 

.136

.137 - .142

.143

 

.144

.145 - .150

.151

 

.152

.153 - .158

.159

 

.160

.161 - .166

.167

 

.168

.169 - .174

.175

 

.176

.177 - .182

.183

 

.184

.185 - .190

.191

 

.192

.193 - .198

.199

 

.200

.201 - .206

.207

 

.208

.209 - .214

.215

 

.216

.217 - .222

.223

 

.224

.225 - .230

.231

 

.232

.233 - .238

.239

 

.240

.241 - .246

.247

 

.248

.249 - .254

.255

 

Subnet Mask
Subnet Bits/Aggregate
Number of Subnets
Network Address

255.255.255.252
30
64
Host IP Range

Hex Mask
Host Bits
Hosts per Subnet
Broadcast Addresses

0xfffffffc
2
2

.0

.1 “ .2

.3

 

.4

.5 - .6

.7

 

.8

.9 - .10

.11

 

.12

.13 - .14

.15

 

.16

.17 - .18

.19

 

.20

.21 - .22

.23

 

.24

.25 - .26

.27

 

.28

.29 - .30

.31

 

.32

.33 - .34

.35

 

.36

.37 - .38

.39

 

.40

.41 - .42

.43

 

.44

.45 - .46

.47

 

.48

.49 - .50

.51

 

.52

.53 - .54

.55

 

.56

.57 - .58

.59

 

.60

.61 - .62

.63

 

.64

.65 - .66

.67

 

.68

.69 - .70

.71

 

.72

.73 - .74

.75

 

.76

.77 - .78

.79

 

.80

.81 - .82

.83

 

.84

.85 - .86

.87

 

.88

.89 - .90

.91

 

.92

.93 - .94

.95

 

.96

.97 - .98

.99

 

.100

.101 - .102

.103

 

.104

.105 - .106

.107

 

.108

.109 - .110

.111

 

.112

.113 - .114

.115

 

.118

.117 - .119

.116

 

.120

.121 - .122

.123

 

.124

.125 - .126

.127

 

.128

.129 - .130

.131

 

.132

.133 - .134

.135

 

.136

.137 - .138

.139

 

.140

.141 - .142

.143

 

.144

.145 - .146

.147

 

.148

.149 - .150

.151

 

.152

.153 - .154

.155

 

.156

.157 - .158

.159

 

.160

.161 - .162

.163

 

.164

.165 - .166

.167

 

.168

.169 - .170

.171

 

.172

.173 - .174

.175

 

.176

.177 - .178

.179

 

.180

.181 - .182

.183

 

.184

.185 - .186

.187

 

.188

.189 - .190

.191

 

.192

.193 - .192

.195

 

.196

.197 - .198

.199

 

.200

.201 - .202

.203

 

.204

.205 - .206

.207

 

.208

.209 - .210

.211

 

.212

.213 - .214

.215

 

.216

.217 - .218

.219

 

.220

.221 - .222

.223

 

.224

.225 - .226

.227

 

.228

.229 - .230

.231

 

.232

.233 - .234

.235

 

.236

.237 - .238

.239

 

242

.241 - .243

.240

 

244

.245 - .246

.247

 

.248

.249 - .250

.251

 

252

.253 - .254

.255

 

Subnet Mask
Subnet Bits/Aggregate
Number of Subnets

255.255.255.255
32
255

Hex Mask
Host Bits
Hosts per Subnet

0xffffffff

1




Check Point NG[s]AI
Check Point NG[s]AI
ISBN: 735623015
EAN: N/A
Year: 2004
Pages: 149

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